lynx-openui

Generate Lynx OpenUI Programs

Generate valid OpenUI Lang v0.5 consumed by <OpenUiRenderer response={...}>. Produce declarative DSL, not application code.

Read The References

• Always read components.md before generating a program. Treat caller-supplied component signatures as authoritative extensions or replacements.
• Read runtime.md when the request involves state, tools, live data, mutations, actions, repeated query data, or edits.
• Read examples.md for a non-trivial layout or tool workflow. Adapt patterns; do not copy irrelevant content.

Workflow

1. Identify the requested UI, exact active component catalog, configured root component, available tool schemas, host-supplied prefetched Query keys, media URLs, and whether the host supports full programs or mergeStatements patches.
2. Choose the data mode:
   • Use static values for self-contained content and when no tool exists.
   • Use Query only for an actual read tool supplied by the caller or host.
   • Use Mutation only for an actual write tool and trigger it from an explicit Action.
3. Select only components and positional arguments allowed by the active catalog. Treat an explicitly reduced catalog as the complete vocabulary: built-ins omitted from it are unavailable. Use the host's explicit root override when present; otherwise use the Library's default Stack root.
4. Write a streaming-friendly graph. For a complete program, put the root first, followed by state, queries or mutations, structural components, and leaf content. For an edit-mode patch, return only changed statements.
5. Validate syntax, references, reachability, component names, argument order, tool names, and action targets before returning the program.

Output Contract

• Return only OpenUI Lang. Do not return Markdown, code fences, prose, JSON, XML, HTML, JavaScript, TypeScript, JSX, or CSS.
• Put one assignment statement on each line.
• For a complete program, make the first non-empty line assign root to a call of the host's explicit root override, for example root = Shell(...). Otherwise use the Library's default root = Stack(...).
• Return a complete program by default. When the caller explicitly says the host uses edit mode or mergeStatements, return only changed statements and include root only when the root graph changes.
• If a request needs an unavailable component or capability, render a concise explanation with supported OpenUI components instead of inventing syntax.

Syntax Rules

• Use identifier = Expression for ordinary declarations and $identifier = defaultValue for mutable state.
• Pass component arguments positionally. Never use named arguments such as gap: "m".
• Omit optional arguments only from the end. When setting a later argument, provide valid values for every earlier position.
• Use double-quoted strings and escape embedded quotes and backslashes.
• Use references or inline components. Prefer references for the root and major sections so streaming reveals the structure progressively.
• Ensure every referenced identifier is defined. Ensure every declaration other than root is reachable from root, an expression reachable from root, or an action reachable from root.
• Use only documented operators, built-ins, components, and action steps.

Correct positional layout using the default Stack root:

root = Stack([header, content], "column", false, "l", "stretch", "start")

Incorrect positional layout:

root = Stack([header, content], "column", "l", "stretch")

The incorrect form passes a string into wrap and shifts every later prop.

Data And Interaction Rules

• Do not invent tool names. If no tool schema is supplied, use static data or an explanatory supported UI.
• Give every Query a representative default result matching the real tool shape so the UI renders in the first synchronous render after the response stabilizes and before the request resolves.
• When the host supplies prefetched Query results, preserve the corresponding Query assignment names. They are statement IDs and prefetch keys, not tool names. See runtime.md.
• Keep Query and Mutation declarations on ordinary identifiers, never $identifiers.
• Use @Each for query-backed repeated UI. Keep its loop-dependent component inline inside @Each.
• Trigger write operations only from an explicit submit or confirmation action on an active-catalog component. With the default catalog, use Button. Do not attach a mutation to an input's change action.
• When an input must update a $variable, use the same-key name pattern in runtime.md. Do not invent an event-value variable.
• Execute multi-step actions in deliberate order. Remember that a failed mutation stops the remaining steps.
• Use @ToAssistant for conversational continuation and @OpenUrl only with a caller-provided or trustworthy URL.
• Use caller-provided media URLs. Do not fabricate CDN URLs or assume the host resolves image-search strings.

Lynx UI Rules

• Prefer compact, mobile-first layouts with a shallow component tree.
• Apply component-specific preferences only when those components exist in the active catalog; otherwise follow the supplied custom signatures.
• With the default catalog, use Stack or Column for ordinary vertical structure, Row for small horizontal groups, and List for grouped or repeated content.
• When Image exists, prefer explicit variants so the Lynx renderer has concrete sizing.
• With the default catalog, keep readable text in Text or TextContent; do not emit raw Lynx elements.
• When available, use Tabs for alternate views and Modal for tap-to-open details. Pass a modal trigger first and content second; do not also render the trigger as a sibling.

Final Verification

Before returning, verify all of the following:

• A complete program assigns root to the host's explicit root override when present, or to the Library's default Stack root otherwise. An edit-mode patch omits root unless the root graph changes. The response contains only OpenUI Lang.
• Every component exists in the active catalog and every argument matches its positional schema. A reduced catalog contains no implicit built-ins, and the root call uses its configured root component.
• No Form, Input, Select, SelectItem, FormControl, table, or chart is used unless the caller supplied that custom component.
• Every reference resolves and no declaration is orphaned.
• Every Query or Mutation uses a real supplied tool and is referenced by visible UI or a visible action.
• Every intended prefetched Query uses its exact host-supplied key as the assignment name, and every Query still has a shape-correct default.
• Every $variable participates in visible UI, a query argument, or an action.
• Every @Each loop variable stays inside its inline template expression.
• No working dynamic list relies on TemplateChildren in the built-in Lynx renderer.
• If a parser is available, parsing finishes with a root, no validation errors, no unresolved references, and no orphaned statements.